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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa652df3990cc03fae38e1c14a41faa9bdb516e705c97e88ad42fa93cf60a994' 
  AND token = '0CJ8mGrlt5opNqEHWu0qiLm/kTL1JmmJ1xf2WYDwCGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}